126 bulletin: museum of comparative zoology. 



ated on segments eighteen and nineteen; caudal angles short but 

 more or less spinous. Anal tergite strongly narrowed caudad, rather 

 narrowly furcate at end much as in Orthomorpha. Pleural keels 

 present, often traceable as far as tenth segment or beyond. Sternites 

 unarmed excepting processes from fifth one in male. Antennae slender, 

 long, joints excepting first and last long, not much differing in length, 

 the sixth clavately enlarged. First legs of male small, not thickened, 

 the third joint without spur or other special modification. Char- 

 acterized in structure of male gonopods. These much resemble 

 those of Antichiropus in having the terminal seminiferous division 

 strongly circularly coiled, the process arising on mesal side and 

 curving first mesad, and then cephalad, ectad and back caudad and 

 mesad. Unlike those of Antichiropus, however, the gonopods have 

 the distal end of tibial division ending in a simply rounded lobe. 

 Genotype. — M. setosum, sp. nov. 



351. Mimosoma setosum, sp. nov. 



Type.— M. C. Z. 4,994. Paratypes.— M. C. Z. 4,995. Solo- 

 mons: Auki (W. M. Mann). 



Color of dorsum from chocolate-brown to black, the keels not paler. An- 

 tennae the same dark color excepting last two articles, which are white, and 

 commonly also the first two articles which are white, or at least much paler 

 than the contiguous ones. Legs also whitish on proximal and distal joints 

 vnih intervening ones dark. 



Keels with caudal angles produced, spinous. Lateral edge of keels in 

 anterior and middle regions with two or three small but sharp teeth or serra- 

 tions, the number rising to four in the posterior region. Tergite with sharply 

 impressed transverse sulcus. Surface strongly roughened with numerous 

 more or less irregularly compressed tubercles which bear long stiff setae of 

 which there are about four irregular transverse rows caudad of the sulcus and 

 six in front of it. Keel essentially obliterated from the nineteenth segment 

 and nearly so from the eighteenth. 



Length, to 14 mm. 



352. Mimosoma reductum, sp. nov. 



Type.— M. C. Z. 5,010. Paratype.— M. C. Z. 5,011. Solomons: 

 Fulakora (W. M. Mann). 



Resembling M. setosum in general coloration though the dorsum is a 

 less deep black, more brownish; antennae with the first two and the 



